Internal dimension gauge



29, 194R s. B. TERRY ETAL INTERNAL DIMENSIGM GAUGE Filed June 22. 1938 g "j I, I3 amn T: E a I m. L3 1/ .aTE ma:

. particularly to a gauge for determining variations lower half of the figure being a transverse secbOdy P tion of the gauge, y the pplication of In the above-mentioned drawing there has been tions in its diameter from *one end to the other he p iv members f the a e head are 'atentedApro a, ran 25 39 -31 1 WERNAL DEWENSIQN GdUGdE Spencer B. Terry, West Hartford, and Raond 8. 1Fon, Hartford, Conn assignors to Niles- Bcment-liond iDompany, Hirer-d, (Donn, a corporation of New Jersey Application time 22, 1938, Serial No. 215,190 4 Cllainns. (@i. 3&- 178) This invention relates to-dimension gauges and taken from the left in Fig. 2 and the other, or

1n the diameter of elongated bores such as pipes, tion taken just inside the cap member of the gun barrels and other objects the internal -diam gau eters of which equire extremely precise deter- Fig. 2 is a longitudinal view of a complete mination. gauge head and a portion of, the tubular exten- An object of the invention is to provide a gauge sion secured thereto shown in Fig. 1, parts being adaptable over a wide range of internal dimenshown in cross section, and A sions and which with appropriate work contact- Fig. 3 is a diagram showing an electric circuit ing members can be used for gauging the varia- 10 by means of which indications of the variations cylindrical bores of heavy ordnance. end'of the gauge upon a suitable indicating in- A feature which is of importance is that the strument.

:aparticular yoke member thereto extending only shown .but one embodiment of the invention partially about-the periphery of the body'mernwhich is now deemed preferable, but it is to be her, may be adapted for any one of a number of understood that changes and modifications different diameters and character or rifling demay be made within the scope of the appended pending upon what particular work contacting a ms wi h t depa n from'the spirit o t e members are mounted on the yoke member. n en i nbore of the member being gauged and the varia,-- an elongated longitu in l Op ng Wi hin which indicated at one end thereof. 4

Another feature that is advantageous isjthat tional extension through which an electric cable the gauge head has induction coils therein b may extend in section to the end of the bore betweenwhich an armature is oscillated by variagaugedtion and illustrated in the accompanying drawtion in the diameter of the bore engaged by a in termining the variations in bore or diameter of a scribed in the p n s n e ry 2,007,840 and rifled gun barrel through out its length, but it will 2,122,6 4, further description of the electricalbe understood that the invention can be otherwise parts of the gauge i n t hought to be necessaryinvention, the claims appended to this specificathe circuit may be mounted independently of the Figure 1 is a transverse view of a, complete 30 through which'the necessary cables may exgauge made in accordance with the present intend. i g vention, one half of this view being an end view Referring more in vdetail to Fig. I, it willbe Y the body member being gauged" Means of this member are provided in the torn: of

dim-n seen that the body member it is surrounded upon opposite sides and its lower portionwith a yoke member it closely fitting the outside surface of it and attached rigidly but detachably thereto by means of suitable screws. It will be understood that the yoke may have different types of contactors 2| inserted at spaced positions-adapted at their outer ends to engage the internalsurface being gauged, that shown in Fig. 1 being a small rifled-bore. The contactors it serve to maintain the body member in proper position within the bore being gauged but do not perform any part of the gauging operation. By removing and substituting other yokes 29 with different length bore contacting members it the gauge may be quickly adapted for operations upon widely different diameters.

The upper surface of the body member it as shown in Fig. 1 not engaged by'the yoke member is provided with .2. sp pressed contacting member 222 of relatively large size preferably having a bearing strip or annulus 23 adapted to contact with a portion of the internal diameter to limit radial movement screws 2 (one only of which is shown) spaced slightly from the upper surface of the body member it and permitting slight in and out movement of this hearing One or more springs engaging member 22 normally force the memberfiQ outwardly into contact with the internal surface being gauged. The spring pressed member 22 is forced outwardly with sufweight of the body member ill and associated Preferably at these joints in the tubular sec tions so there may be mounted supporting members a l in the form of flanges having contacting members inserted in their periphery adapted to slide freely within the bore being gauged. By substituting difierent types of contacting members 3'5 in these flanges or discs 3d the gauge may sion attached to said body member having a. sup-- parts when the of the bore rotates the body member to inverted positions. tion of the body member it is efiected by the contactor it formed to enter one or more grooves of the rifiing and. using thebody member it to slowly change position as the gauge traverses Movable contactor it i the length of the bore. and the member 22 are diametrically opposite the contactor, iii. Movement radially of the contactor It will therefore accurately-indicate variations. in diameter of the bore being gauged. Centrally disposed thin-this spring pressed member 22. is the movable contactor it normally pressed lightlyinwardly the armature H by a helical spring 46- surrounding the inner end of m be!" it.

the armature are forced outwardly by the armature spring 26 which is stronger than spring it.

The inner end-of the member l6 rests upon the cam surface of a rotatable member ll mounted contacting members, means normally be adapted for widely difierent diameters.

We. claim as our invention:

1. An internal dimension gauge comprising in combination, a' body member, fixed bore contact ing members removably secured thereto, a radially movable bore contacting member disposed diametrically opposite one of said fixed contact- 7 ing members, means nor lly forcing said movable contacting member into contact with said bore, a'spring pressed bearing member surrounding said movable contacting member and forcing one of said fixed contacting members constantly into contact with the bore being gauged, means engaging said movable contacting member, a member actuated thereby to indicate the radial position of said movable member, and an extenporting member thereon, whereby said gauge may be maintained in successive gauging positions along a bore being gauged.

2. 'An internal dimension gauge comprising in combination, a body member, a yoke member secured to theoutside or said body member, fixed bore contacting members removably secured to said yoke member adapting said gauge to a predetermined size, a radially movable contacting member oppositely disposed to one of said fixed forcing said movable contacting member into contact with said bore, means en ag g said movable contacting member and controlled by movements thereof to indicate the position of said movable contacting member, and an extension attached to said body member having a supporting mem- ,ber thereon, whereby said-gauge may be'maintained in successive gauging positions along a bore being gauged.

H the gauge may be adjusted for relatively small variations in diameter without removal of the gaging members 2| and substimtlon of others. This armature H, as shown in Fig; 2, is

forced normally toward its outer or maximum diameter position by this spring 26 so that the movable contactorli is constantly normally held in its outermost position relative to the body member. p a Extending from one end of the body member In ls'an elongated tubular member 30 the outer end ofwhich is provided with a portion of a three wire locking connection 3| the companion piece 32 of which is housed in the forward end of a corresponding tubular section 33. By Putting sections 33 adjacent eachother with the companion parts of the connectors 3i and 32 in-interlocking positions circuits including the induction 3. An internal dimension gauge comprising in combination, a body member, a yoke member tie-- tachably mounted on said body member and extending partially about the periphery thereof, fixed bore contacting members secured thereon, a radially movable contacting member wihin said body member oppositely disposed to one of said fixed contacting members on said yoke, said yoke member removable from said body member while said movable contacting member remains in place, means normally forcing said.

movable-member into contact with said bore,

meansen aging said movable contacting member,

means controll thereby, to indicate the position of said movable contacting member, and an extension attached to said body member having a supporting member thereon, gauge is maintained in proper gauging position at succe ve positions along a bore being gauged.

4. An internal dimension gaugefor rifled bores comprising in combination, a body member, a

yoke member vdetachably mounted thereon and extending partially about the periphery thereof, fixed bore contacting members secured to said yoke. member, a. plate on said yoke having portions en the rifiing of said bore and rotating the gauge with said trifling as the gage is ailvanced along the bore, a radially movable contacting member oppositely to said plate.

whereby said ma am .1

said yoke member pi removable from member, and an extension attached to said body said body member while d movable coni'actmember having a supporting member thereon, ing member rns in place. m noywhereby said gauge is maintained in gauging forcing said movable contacting member into position at successive positions along a bore becontact with said bore, mounted Within 5 mg gauged. I

said body member and or said movable SPENCER B. RY. contacting member, in control! thereby to RAQND 8. FOX.

indicate the position of said movable contacting 

